13556745081 has 96 divisors (see below), whose sum is σ = 23896529280. Its totient is φ = 7299072000.

The previous prime is 13556745061. The next prime is 13556745113. The reversal of 13556745081 is 18054765531.

13556745081 is a `hidden beast` number, since 1 + 3 + 5 + 567 + 4 + 5 + 0 + 81 = 666.

It is not a de Polignac number, because 13556745081 - 2⁹ = 13556744569 is a prime.

It is a super-2 number, since 2×13556745081² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13556745011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11287281 + ... + 11288481.

It is an arithmetic number, because the mean of its divisors is an integer number (248922180).

Almost surely, 2^13556745081 is an apocalyptic number.

13556745081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13556745081 is a deficient number, since it is larger than the sum of its proper divisors (10339784199).

13556745081 is a wasteful number, since it uses less digits than its factorization.

13556745081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 13556745081 in words is "thirteen billion, five hundred fifty-six million, seven hundred forty-five thousand, eighty-one".